2IO LEPIDOPTERA. 



Surrey. More recently the late Mr. W. H. Tugwell found it 

 to be the dominant form among the yew trees of Mickleham 

 Downs and Boxhill, in the same county ; and it has been 

 obtained, along with the more typical specimens, in the New 

 Forest, Hants. 



On the wing in June, July, and the beginning of August. 

 A casual specimen obtained in 1868 as late as August 29th 

 may have been a late specimen only, since we have no other 

 evidence of a second generation in the season. 



Larva one inch and a half long ; head a little less than 

 the second segment, its lobes rounded and well defined on the 

 crown ; the segmental divisions indicated by a fold of the 

 skin ; beyond the thoracic segments the dorsal region of each 

 has two anterior faint wrinkles and three or four towards the 

 hinder end, rather deeper on the sides ; here the skin is much 

 puffed and puckered, especially along the spiracular region ; 

 muscles of the ventral and anal prolegs largely developed ; 

 raised dots rather prominent, especially the hinder dorsal 

 pairs, which are larger than the front pairs, and, as well as 

 those along the sides are on little tumid eminences; head 

 much freckled with reddish-brown ; a brown conspicuous 

 spot on the front of each lobe, and another just above each 

 papilla ; of the ground colour there are two varieties ; one is 

 light ochreous-brown, having conspicuously paler cream- 

 coloured patches on the back of several segments ; the other 

 dark greyish-brown with paler patches, sometimes of a light 

 cinnamon-brown, often palest on the fifth, ninth, and tenth 

 segments ; the dorsal line is but just indicated on the thoracic 

 •segments by very short, double, black marks at their divisions, 

 but it is more complex on the other segments, being composed 

 of a fine central pale thread within two lines, or series of 

 brown freckles, which widen and contract on each segment ; 

 parallel to these is a pale line edged outside with a line of 

 brown freckles, lighter and darker ; and then with an interval 

 of ground colour a stout pale subdorsal line, edged on each 



